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5700A/5720A Series II Calibrator
Service Manual
3-34
1. Connect the equipment as shown in Figure 3-12(A) use the 2A shunt.
2. Enter the ac to dc difference corrections for each shunt at each frequency in the
appropriate column of the test record (Table 3-26 or 3-27).
3. Set the Calibrator for a +2A dc output. Adjust the output so that the error display is
equal to the UUT actual error for a +2A output, as shown on the dc current test
record in Table 3-20 (5720A) or Table 3-21 (5700A).
4. Push the INPUT 1 button on the 5790A if you are using the INPUT 1 setup, or the
SHUNT button if you are using the SHUNT set up. Let the 5790A settle on a
reading.
5. Push the SET REF soft key on the 5790A.
6. Set the Calibrator for a -2A dc output. Adjust the output so that the error display is
equal to the UUT actual error for a -2A output, as shown in Table 3-20 (5720A) or
Table 3-21 (5700A).
7. Press the AVG REF soft key on the 5790A after the 5790A reading settles.
8. Set the Calibrator to 2A at 40 Hz and OPERATE.
9. Record the error displayed on the 5790A in Table 3-26 or 3-27.
10. Return to the error corrected +2A DC output that was set in step 3 and verify that the
5790A display returns to a zero reading ±10 PPM. If necessary, repeat steps 3
through 9 until the required results are obtained.
11. Algebraically add the 5790A error display reading to the A40 Shunt ac to dc
difference, and verify that the result is within the specifications of the test limits.
Record the results on Table 3-26 (5720A) or Table 3-27 (5700A).
12. Change the Calibrator frequency to 1 kHz, 5 kHz and 10 kHz. At each frequency
record the 5790A error display. Verify the results as was done in steps 8 and 9.
13. Repeat steps 3 through 12 at currents of 200 mA and 20 mA using the appropriate
A40 current shunt at the frequencies shown on the test record (Table 3-26 or 3-27).
14. For units with a 5725A Amplifier attached, use the test set up shown in Figure
3-12(B) using the 10A shunt at the frequencies listed on the test record.